CN115286208A - System and method for drying and co-processing sludge by using waste heat of cement kiln - Google Patents
System and method for drying and co-processing sludge by using waste heat of cement kiln Download PDFInfo
- Publication number
- CN115286208A CN115286208A CN202211025946.4A CN202211025946A CN115286208A CN 115286208 A CN115286208 A CN 115286208A CN 202211025946 A CN202211025946 A CN 202211025946A CN 115286208 A CN115286208 A CN 115286208A
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- Prior art keywords
- sludge
- heat
- drying
- kiln
- cement kiln
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- 239000010802 sludge Substances 0.000 title claims abstract description 97
- 238000001035 drying Methods 0.000 title claims abstract description 38
- 239000004568 cement Substances 0.000 title claims abstract description 34
- 239000002918 waste heat Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 230000003750 conditioning effect Effects 0.000 claims abstract description 20
- 239000000428 dust Substances 0.000 claims abstract description 8
- 239000000706 filtrate Substances 0.000 claims description 21
- 239000002912 waste gas Substances 0.000 claims description 21
- 239000010865 sewage Substances 0.000 claims description 10
- 239000000779 smoke Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000018044 dehydration Effects 0.000 claims description 4
- 238000006297 dehydration reaction Methods 0.000 claims description 4
- 239000003814 drug Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 238000004134 energy conservation Methods 0.000 abstract 1
- 238000000746 purification Methods 0.000 abstract 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a system and a method for drying by waste heat of a cement kiln and co-processing sludge, wherein the system comprises a sludge receiving and dehydrating unit, a sludge drying and kiln entering unit and a tail gas purifying unit, wherein the sludge receiving and dehydrating comprises a sludge receiving bin, a sludge conditioning tank, a dosing system and a high-pressure diaphragm plate-and-frame filter press; the sludge waste heat drying disposal unit comprises a hollow blade dryer, a heat conduction oil boiler, a fin heat exchanger and kiln entering conveying equipment; the tail gas purification unit comprises a cyclone dust collector and a condenser. The system firstly mechanically dehydrates the sludge, and then indirectly dries the sludge after heat exchange of the heat transfer oil by using the waste heat of the cement kiln, thereby greatly reducing the water content of the sludge, improving the adding amount of the cooperative treatment, having low energy consumption and little secondary pollution, and realizing the effects of energy conservation and carbon reduction while harmlessly treating the sludge.
Description
Technical Field
The invention relates to the field of sludge treatment, in particular to a system and a method for drying and co-processing sludge by using waste heat of a cement kiln.
Background
The mode that the sludge of the sewage plant is cooperatively treated by the cement kiln as resource utilization is one of important ways for realizing the standardized treatment and utilization of the sludge. The cement kiln co-processing technology not only utilizes the heat generated by burning the organic components in the sludge as a part of heat source, but also utilizes the inorganic components in the sludge to replace a part of raw materials, thereby realizing the resource utilization of the organic components and the inorganic components in the sludge. However, the factory sludge of the sewage treatment plant usually has high water content and low heat value, which has adverse effect on cement production and energy consumption and influences the large-scale burning application in the cement kiln. The single dehydration mode is difficult to greatly reduce the water content of the sludge, and the problems of high energy consumption and large pollution exist.
Disclosure of Invention
The invention aims to provide a system and a method for drying and co-processing sludge by using waste heat of a cement kiln, which greatly reduce the water content of the sludge, and have the advantages of low energy consumption and less secondary pollution.
The technical scheme adopted by the invention for solving the technical problem is as follows: the system for drying the waste heat of the cement kiln and co-processing the sludge is constructed and comprises a sludge receiving and dehydrating unit, a sludge waste heat drying kiln-entering unit and a waste gas treatment unit which are sequentially connected;
the sludge receiving and dewatering unit comprises a sludge receiving bin, a sludge conditioning tank and a high-pressure diaphragm plate-and-frame filter press which are sequentially connected, wherein the conditioning tank is provided with a dosing system which is used for conveying a medicament required by sludge conditioning;
the sludge waste heat drying kiln entering unit comprises a hollow blade dryer, a heat conduction oil boiler, a fin heat exchanger and kiln entering conveying equipment, wherein a heat source of the heat conduction oil boiler comes from hot smoke of a kiln head, the low-temperature smoke after heat exchange returns to the kiln head, the heat conduction oil boiler is respectively connected to the hollow blade dryer and the fin heat exchanger, a hot air outlet of the fin heat exchanger is connected to the hollow blade dryer, and a waste gas outlet of the hollow blade dryer is connected to a waste gas treatment unit.
According to the scheme, a filtrate outlet of the high-pressure diaphragm plate filter press is connected to a filtrate water tank, and part of the filtrate is recycled to the sludge conditioning tank.
According to the scheme, the sludge discharged from the hollow blade dryer is conveyed to the decomposing furnace by the feeding conveyor to be incinerated.
According to the scheme, the waste gas treatment unit comprises a cyclone dust collector and a condenser, and a waste gas outlet of the condenser is led to the high-temperature section of the cement kiln grate cooler.
The invention also provides a method for drying waste heat of a cement kiln and disposing sludge cooperatively, wherein wet sludge is received and stored in a sludge receiving bin and then is sent to a sludge conditioning tank, a medicament is added by a medicament adding system, the mixture is uniformly mixed and then enters a plate-frame filter press for mechanical dehydration, the dehydrated sludge enters a hollow blade dryer, the generated filtrate is collected to a filtrate water tank, part of the filtrate is recycled for conditioning the sludge, the rest of the filtrate is sent to a sewage treatment station for treatment, heat-conducting oil is used as a drying heat medium in the hollow blade dryer, a heat source for heating the heat-conducting oil is derived from waste heat smoke at the head of the cement kiln, part of the heat-conducting oil is used for heating fresh air by a fin heat exchanger and is blown to the blade dryer to take away water vapor generated by drying, the dried sludge is sent to a cement kiln decomposing furnace for incineration by kiln conveying equipment, waste gas generated in the drying process is treated by a cyclone dust collector and a condenser and then enters a grate cooler high-temperature section for incineration, and condensed water is sent to a sewage treatment system for treatment.
The system and the method for drying the waste heat of the cement kiln and co-processing the sludge have the following beneficial effects that:
the system for drying the waste heat of the cement kiln and cooperatively treating the sludge firstly mechanically dehydrates the sludge, and then indirectly dries the sludge after the waste heat of the cement kiln is subjected to heat exchange by the heat conduction oil, so that the water content of the sludge is greatly reduced, the adding amount of cooperative treatment is increased, the energy consumption is low, the secondary pollution is less, and the sludge is harmlessly treated while the energy-saving and carbon-reducing effects are realized.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a system for drying and co-processing sludge by waste heat of a cement kiln according to the present invention.
Detailed Description
For a more clear understanding of the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in figure 1, the system for drying by waste heat of the cement kiln and co-processing sludge comprises a sludge receiving and dehydrating unit, a sludge waste heat drying kiln-entering unit and a waste gas treatment unit which are sequentially connected.
The sludge receiving and dewatering unit comprises a sludge receiving bin 1, a sludge conditioning tank 2 and a high-pressure diaphragm plate-and-frame filter press 3 which are sequentially connected, and the conditioning tank is provided with a dosing system 4. Wet sludge with the water content of 80% is received and stored to a sludge receiving bin 1, sludge conditioning agents (PAC + PAM) are added after being conveyed to a sludge conditioning tank 2, the wet sludge is conveyed to a plate and frame filter press 3 after being stirred and mixed, the water content of the sludge after being extruded and dewatered by the plate and frame filter press 3 is reduced to about 55%, extruded filtrate is collected to a filtrate water tank 5, part of the filtrate is reused in a sludge conditioning stage, and the rest filtrate is conveyed to a sewage treatment station.
The sludge waste heat drying kiln entering unit comprises a hollow blade dryer 6, a heat conduction oil boiler 7, a fin heat exchanger 8 and kiln entering conveying equipment 9. The dewatered sludge enters a sludge waste heat drying kiln entering unit and is dried in a hollow blade dryer 6, a drying heat medium is heat conducting oil, a heat source of a heat conducting oil boiler 7 is from waste heat smoke (about 380 ℃) of a kiln head grate cooler, the heat conducting oil is heated by the waste heat smoke, low-temperature smoke (about 300 ℃) after heat exchange returns to a kiln head AQC boiler, a small part of heated heat conducting oil is used for a fin heat exchanger 8 to heat air, and the hot air is also sent to the hollow blade dryer 6 and is used for carrying out water vapor generated by drying the sludge. The water content of the dried sludge is reduced to below 30 percent, the heat value is improved to 1800-2000kcal/kg, and the dried sludge is sent to a cement kiln decomposing furnace by a feeding conveyor 9 for final incineration disposal.
The waste gas treatment unit comprises a cyclone dust collector 10 and a condenser 11, and a waste gas outlet of the condenser 11 is led to the high-temperature section of the cement kiln grate cooler. A small amount of waste gas generated by drying enters a waste gas treatment system, sludge dust in the waste gas is recovered through a cyclone dust collector 10, a large amount of water vapor contained in the waste gas is condensed through a condenser 11, then the condensed gas is introduced to a high-temperature section of a grate cooler of a cement kiln for incineration treatment, and the generated condensed water is sent to a sewage treatment station for treatment.
The invention also provides a method for drying by using the waste heat of the cement kiln and co-processing sludge, which comprises the following steps:
wet sludge is received and stored in a sludge receiving bin and then is sent to a sludge conditioning tank, a chemical is added by a chemical adding system, the mixture is uniformly mixed and then enters a plate-and-frame filter press for mechanical dehydration, the dehydrated sludge enters a hollow blade dryer, the generated filtrate is collected to a filtrate water tank, part of the filtrate is recycled for sludge conditioning, and the rest of the filtrate is sent to a sewage treatment station for treatment. The hollow blade dryer uses heat conduction oil as a drying heat medium, a heat source for heating the heat conduction oil is derived from waste heat smoke of a cement kiln head, part of the heat conduction oil is used for heating fresh air by a fin heat exchanger, the fresh air is blown into the blade dryer to carry away water vapor generated by drying, and dried sludge is conveyed to a cement kiln decomposing furnace by kiln conveying equipment to be burned. And after the waste gas generated in the drying process is treated by the cyclone dust collector and the condenser, the waste gas enters the high-temperature section of the grate cooler for incineration treatment, and the condensed water is sent to a sewage treatment system for treatment.
While the present invention has been described with reference to the particular illustrative embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications, equivalent arrangements, and equivalents thereof, which may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A system for drying waste heat of a cement kiln and co-processing sludge is characterized by comprising a sludge receiving and dewatering unit, a sludge waste heat drying kiln-entering unit and a waste gas treatment unit which are sequentially connected;
the sludge receiving and dewatering unit comprises a sludge receiving bin (1), a sludge conditioning tank (2) and a high-pressure diaphragm plate-and-frame filter press (3) which are sequentially connected, the conditioning tank is provided with a dosing system (4), and the dosing system (4) is used for conveying a medicament required by sludge conditioning;
the sludge waste heat drying kiln entering unit comprises a hollow blade dryer (6), a heat conduction oil boiler (7), a fin heat exchanger (8) and kiln entering conveying equipment (9), wherein a heat source of the heat conduction oil boiler (7) comes from hot smoke of a kiln head, the low-temperature smoke after heat exchange returns to the kiln head, the heat conduction oil boiler (7) is connected to the hollow blade dryer (6) and the fin heat exchanger (8) respectively, a hot air outlet of the fin heat exchanger (8) is connected to the hollow blade dryer (6), and a waste gas outlet of the hollow blade dryer (6) is connected to a waste gas treatment unit.
2. The system for drying by waste heat of the cement kiln and co-disposing sludge according to claim 1, wherein a filtrate outlet of the high-pressure diaphragm plate filter press (3) is connected to a filtrate water tank (5) and is partially recycled to the sludge conditioning tank (2).
3. The system for drying and co-disposing sludge by using the waste heat of the cement kiln as claimed in claim 1, wherein the sludge from the hollow paddle dryer (6) is conveyed to the decomposing furnace for incineration by the feeding conveyor (9).
4. The system for drying by waste heat of the cement kiln and co-disposing the sludge as claimed in claim 1, wherein the waste gas treatment unit comprises a cyclone (10) and a condenser (11), and the waste gas outlet of the condenser (11) is led to the high temperature section of the grate cooler of the cement kiln.
5. A sludge disposal method of a system for drying and cooperatively disposing sludge by using waste heat of a cement kiln as claimed in claim 1 is characterized in that wet sludge is received and stored in a sludge receiving bin, then the wet sludge is sent to a sludge conditioning tank, a chemical is added by a chemical adding system, the mixture is uniformly mixed and then enters a plate-frame filter press for mechanical dehydration, the dehydrated sludge enters a hollow paddle dryer, the generated filtrate is collected to a filtrate water tank, part of the filtrate is recycled for conditioning the sludge, the rest of the filtrate is sent to a sewage treatment station for treatment, heat conduction oil is used as a drying heat medium in the hollow paddle dryer, a heat source for heating the heat conduction oil is derived from waste heat smoke of a cement kiln head, part of the heat conduction oil is used for a fin heat exchanger to heat fresh air, and the fresh air is blown into the paddle dryer to carry away water vapor generated by drying, the dried sludge is sent to a cement kiln decomposing furnace by kiln conveying equipment for incineration, waste gas generated in the drying process is treated by a cyclone dust collector and a condenser, and then enters a grate cooler for incineration treatment, and condensed water is sent to a sewage treatment system for treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211025946.4A CN115286208A (en) | 2022-08-25 | 2022-08-25 | System and method for drying and co-processing sludge by using waste heat of cement kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211025946.4A CN115286208A (en) | 2022-08-25 | 2022-08-25 | System and method for drying and co-processing sludge by using waste heat of cement kiln |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115286208A true CN115286208A (en) | 2022-11-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211025946.4A Pending CN115286208A (en) | 2022-08-25 | 2022-08-25 | System and method for drying and co-processing sludge by using waste heat of cement kiln |
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| CN (1) | CN115286208A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118388109A (en) * | 2024-06-28 | 2024-07-26 | 山东清大汇中清洁能源科技有限公司 | Waste heat driven sludge drying and recycling system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005321131A (en) * | 2004-05-07 | 2005-11-17 | Sanki Eng Co Ltd | Sludge incinerating system |
| WO2010007325A2 (en) * | 2008-07-18 | 2010-01-21 | Saint-Gobain Glass France | Industrial device manufacturing its own fuel |
| CN102964047A (en) * | 2012-07-23 | 2013-03-13 | 北京水泥厂有限责任公司 | Treatment method of sludge drying |
| CN202988932U (en) * | 2012-11-23 | 2013-06-12 | 首大能源环保集团有限公司 | Sludge comprehensive disposal system |
| CN103819069A (en) * | 2013-12-24 | 2014-05-28 | 华新环境工程有限公司 | Deep sludge dewatering method and cement kiln comprehensive utilization method using same |
-
2022
- 2022-08-25 CN CN202211025946.4A patent/CN115286208A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005321131A (en) * | 2004-05-07 | 2005-11-17 | Sanki Eng Co Ltd | Sludge incinerating system |
| WO2010007325A2 (en) * | 2008-07-18 | 2010-01-21 | Saint-Gobain Glass France | Industrial device manufacturing its own fuel |
| CN102964047A (en) * | 2012-07-23 | 2013-03-13 | 北京水泥厂有限责任公司 | Treatment method of sludge drying |
| CN202988932U (en) * | 2012-11-23 | 2013-06-12 | 首大能源环保集团有限公司 | Sludge comprehensive disposal system |
| CN103819069A (en) * | 2013-12-24 | 2014-05-28 | 华新环境工程有限公司 | Deep sludge dewatering method and cement kiln comprehensive utilization method using same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118388109A (en) * | 2024-06-28 | 2024-07-26 | 山东清大汇中清洁能源科技有限公司 | Waste heat driven sludge drying and recycling system |
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Application publication date: 20221104 |
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